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为了精确估计频率步进雷达目标参数并进行运动补偿,提出了基于调频傅里叶变换的目标径向运动速度补偿方法。与本振信号混频后目标散射点回波可看作线性调频信号,其相位一次项和二次项只与目标速度和初始距离有关,通过搜索调频傅里叶变换的调频率和频率参数,获得了目标运动速度和初始距离的精确估计,然后实现运动补偿。仿真结果进一步验证了文章所采用方法的有效性和实用性。另外,通过与最小脉组误差估计法比较说明了文章所提方法具有更好的抗干扰能力;最后还对多目标运动速度估计问题进行了初步探讨。
In order to accurately estimate the target parameters of frequency stepping radar and perform motion compensation, a method of target radial motion velocity compensation based on frequency-hopping Fourier transform is proposed. After mixing with the LO signal, the target scatter point echo can be regarded as a linear FM signal. The first order and second order terms of the phase are only related to the target speed and the initial distance. By searching the tuning frequency and frequency parameters of the FM Fourier transform, An accurate estimation of the target velocity and initial distance is obtained, and then motion compensation is achieved. The simulation results further verify the effectiveness and practicability of the method used in the article. In addition, compared with the minimum pulse error estimation method shows that the method proposed in this paper has better anti-interference ability; Finally, the multi-target motion velocity estimation is also discussed.